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Date: Mon, 7 Aug 2006 07:18:17 -0700 (PDT)
From: "Yonik Seeley (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-639) [PATCH] Slight performance
 improvement for readVInt() of IndexInput
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    [ http://issues.apache.org/jira/browse/LUCENE-639?page=comments#action_12426225 ] 
            
Yonik Seeley commented on LUCENE-639:
-------------------------------------

> I also think that you drew your conclusion too fast.

My conclusion was that I didn't personally have more time to spend on this right now given that initial results with a lucene index were dissapointing on a major platform with the latest JVMs.  If people want to run this test on other platforms, or create even more realistic tests, that's fine with me... I'll still listen in :-)

> [PATCH] Slight performance improvement for readVInt() of IndexInput
> -------------------------------------------------------------------
>
>                 Key: LUCENE-639
>                 URL: http://issues.apache.org/jira/browse/LUCENE-639
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: 2.0.0
>            Reporter: Johan Stuyts
>            Priority: Minor
>         Attachments: Lucene2ReadVIntPerformance.patch, readVInt performance results.pdf, ReadVIntPerformanceMain.java
>
>
> By unrolling the loop in readVInt() I was able to get a slight, about 1.8 %, performance improvement for this method. The test program invoked the method over 17 million times on each run.
> I ran the performance tests on:
> - Windows XP Pro SP2
> - Sun JDK 1.5.0_07
> - YourKit 5.5.4
> - Lucene trunk

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